Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MR-12 found under Housing Bearing Unit by Ingersoll Rand Inc. The National Stock Number assigned to this part is 3130013036346, and the Federal Supply Class is 3130 Bearings Mounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MR-12.